It is the worst attack to hit Britons since the July 7 terror bombings.

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It is feared that the world famous tennis tournament could be targeted by Islamist terrorists

Scotland Yard is preparing for an extensive security operation during next week's 10th anniversary of the 2005 attack.

The response follows an increase in police numbers over the weekend at both the London Pride parade and Armed Forces Day.

Nearly 400 officers have also been deployed to UK airports across the country.

Home Secretary Theresa May said British security teams are looking "at protective security arrangements at tourist resorts” around the world, as the Foreign Office warned of further attacks similar to Tunisia.

The Met Police’s assistant commissioner Mark Rowley said: “The national policing response to the attack in Tunisia is likely to be one of the largest counter-terrorism deployments seen since July 2005.

“It is right that we keep our security plans under continual review to help protect and reassure the public.

"There has been a significant increase in the level of counter-terrorist policing activity in the UK.

"Last year, there were over 330 arrests – about one a day – and 89 people were convicted for terror-related offences.”

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The police are urging fans at the tournament to remain vigiland

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Andy Murray is looking to regain his Wimbledon crown this year

Scotland Yard has encouraged tennis fans to go about their day as normal but to remain vigilant.

World number one Novak Djokovic starts the defence of his Wimbledon title today with Andy Murray out on court tomorrow.

Murray is seeking another Grand Slam victory on the SW19 grass courts but faces a tough draw with Rafael Nadal, Roger Federer and Djokovic all possible opponents on his path to the final.

The 28-year-old Scot will also have to deal with temperatures reaching a possible 36C this week.